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BEGINS DAY OF
THE PRIMEVAL OCEANS 13 RADIATING REPTILES
THE AGE OF FISHES 27 REPTILES OF THE SEAS
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65 million Africa Age of Dinosaurs Age of Mammals amphibians Anatosaurus ancestor animals apes Australopithecus backbone Baryonyx became bigger birds body bones bony plates Brontotherium called carnivore changed chimps claws clues creatures creodont Cro-Magnon Darwin Devonian Dimetrodon dinosaurs discovered early Earth eggs elephants Eocene evolution evolutionary evolved extinct feet long fish fossil experts fossils show giant gill gradually herbivores Homo erectus Homo habilis Homo sapiens hoofed mammals huge jaws land layers legs living things lobe-fin looked Lucy Macrauchenia mammals meat eaters meat-eating million years ago modern humans mouth nautiloid Neanderthal Oligocene Paraceratherium pelycosaurs perhaps period Permian placoderms plant eaters plant-eating prehistoric preserved prey primitive probably pterosaurs Ramapithecus remains reptiles rhinos robust rocks sauropods scientists shape shells similar skeleton skin skull small brains South America species tadpoles teeth thecodonts Thylacosmilus today's tough tree trilobites walked warm